A new method for evaluating stress intensity factors of planar crack in 3-D solid
估算裂纹应力强度因子的新方法

According to the inherent relation between the crack shape and the stress intensity factor (SIF) distribution along the crack front,a gradientless iterative method is proposed for obtaining the shape and the corresponding SIF of mode-I planar crack with a given SIF distribution function under the condition of Linear Elastic Fracture Mechanics. Numerical examples for planar cracks in through-cracked and surface-cracked plates with limited thickness and width are presented to show the vahdity and practicabihty of the proposed method. The effects of various SIF distribution functions on the shape and the corresponding SIF of cracks are analyzed and discussed. The presented method is shown to be an effective alternative for the evaluation of SIFs and the prediction of shape evolution for growing cracks.